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[write-fonts] Only use IUP in gvar when more compact
This requires changing the API for the PackedDeltas type so that the caller does not pre-prune deltas that can be interpolated, since we need to know these values if we decide *not* to interpolate; this also requires changing the iup_delta_optimize method to not discard deltas that can be interpolated. In a quick test on GS this reduces the size of the gvar table from 3231 kb to 2829 kb. There is one other potentially significant optimization remaining, which is to share points between tuples where possible.
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